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제안 방법
- In this Letter, we propose a new method of evaluating the content of SWCNTs using UV-VIS-NIR absorption spectroscopy which considers the amounts of both semiconducting and metallic SWCNTs in SWCNT soot.
- Next, we integrated the S22 peak and M11 peak in absorption spectrum of the SWCNT solution to be evaluated, labeled each value as AtS and AtM respectively, and labeled the sum of these two values as AtSM. A straight line was drawn between each end point of the S22 peak.
- Absorption spectroscopy was performed with following conditions. The reference SWCNT solution, assumed to be 100% SWCNT, and the SWCNT solutions to be evaluated were placed each in a 1 mm path length spectroscopic quartz cell, and the absorption spectrum was measured using a UV-VIS-NIR spectrophotometer (V-570, JASCO). The SWCNT was placed in the cell prior to addition of the dispersion solution when the solution was mixed.
- We have suggested a method of evaluating the content of SWCNT among the carbon complexes in SWCNT soot using UV-VIS-NIR absorption spectroscopy. We have verified the result of our method using a series of constructed samples with designed content that the evaluated contents are well matched with high enough accuracy to the designed contents from the purified reference. We believe that our method provides an accurate way to evaluate the content of SWCNTs and may play a key role in investigating the relationship between the purity of SWCNT to its functionality in many applications.
이론/모형
- 3. Evaluated content vs. Constructed content of SWCNTs calculated with our method(square) and non-linear method(circle).
- In this study, we only used the SWCNTs synthesized by arc discharge method. We believe that our method would produce the similar result with a reasonable accuracy in content evaluation also for the SWCNTs synthesized by HipCo or laser vaporization.
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